Plant for heating galvanizing baths and other baths for containing molten material



g- 1949- J. J. STORDY 3,

PLANT FOR HEATING GALVANIZING BATES AND OTHER BATHS FOR CONTAINING MOLITEN MATERIAL I 2 Sheets-Sheet 1 Filed Feb. '7, 1946 IllnL 5 15 gtovciy.

I I f I 1 1949. J. J. STORDY PLANT FOR HEATING GALVANIZING BA'IHS AND OTHER BATI'IS FOR CONTAINING MOL'IEN MATERIAL Filed Feb. '7, 1946 2 Sheets-Sheet 2 VENTOR,

361m ovgly ATTORN EY.

Patented Aug. 2, 1949 PLANT FOR HEATING GALVANIZIN G BATHS AND OTHER BATHS FOR CONTAINING MOLTEN MATERIAL John James Sturdy, Penn, Wolverhampton, England, assignor to Thompson Brothers (Bilston) Limited, Bilston, England Application February 7, 1946, Serial No. 646,056

In Great Britain February 9, 1945 2 Claims. 1

The invention relates more especially to a plant for heating galvanising baths, but is applicable to other baths for containing molten material and has for its object to eifect improvements therein.

In the type of plant to which this invention relates, heated gas or gases are conducted from a furnace or other heating appliance. through passages which pass round the upper parts of the sides of the bath, usually from the middle of one end, along the two sides to the middle of the other end, and from thence the gases are conducted to lower passages also passing along the sides of the bath and by which they are returned to the heater where they are reheated and recirculated.

In order to effect the circulation of the gases it has been proposed to place a fan in the passage leading from the heater to the upper passages surrounding the bath, but this has the disadvantage that the temperature of the gases leaving the heater must be kept within such limit-s as will ensure that the fan will not suffer injury therefrom.

According to this invention the fan is placed in the stream of gases at a point where the temperature is lowest, or at a point where it is considerably below maximum. The fan may, for instance, be placed so as to handle the gases just before they are-returned to the heater for reheating, or it may be placed at the point where the gases pass from the upper passages to the lower passages, or at some intermediate position.

If the heated gases are products of combustion, a proportion thereof is led oil to an uptake and such proportion made up by fresh products of combustion from the furnace. In such case, the return flow of gases may be impelled by the fan into a chamber which also receives products of combustion from the furnace, and from such chamber the gases are recirculated.

An example of the invention is described with reference to the accompanying drawings, in which- Figure 1 is a view, in longitudinal section, of a galvanising plant arranged according to the invention, the middle portion of the plant being shown broken away.

Figure 2 is a sectional plan view of the plant shown in Figure 1, the upper half of the view being a section taken on the line 2, 2, of Figure 1, and the lower half being a section taken on the line 2a, 2a, of Figure 1.

Figure 3 is a continuation of Figure 2.

In these drawings, In is the alvanising bath and II the furnace, the hearth l2 of which is fed by an automatically controlled mechanical stoker l3. From the furnace the products of combustion are led through a mixing chamber M from which branch two upper passages l5 which pass along the upper part of the bath I0, one of these passages being shown in Figure 2. The passages [5 open at their ends into a transverse upper flue 16 from which there leads off a pipe H which forms the suction pipe of a fan [8.

The delivery pipe l9 0! the fan leads to a lower transverse flue 20 communicating with two passages 2l which lead back over the lower parts of the sides of the bath l0, and return to the lower part of the mixing chamber l4 from which they are recirculated by the action of the fan l8. The gases are reheated in the chamber M which is exposed to the heat of the furnace and the products of combustion therefrom.

Leading from one of the passages 2| is a branch flue 23 which leads to an uptake 24. The flow of the gases along the flue 23 is controlled by a, damper 25.

The flue 23 acts as a bleed-oflf from the system and the damper 25 consequently controls the rate of flow of products of combustion from the furnace into the system.

26 is a flue leading from the suction pipe H to I the uptake 24. It is for use in case of a breakdown in the fan. Normally it is closed off by a damper 21.

Having fully described my invention, what I claim and desire to secure by Letters Patent is:

l. A plant for heating a bath for containing molten material and comprising a furnace from which products of combustion pass, a chamber into which the products of combustion pass, a bath, upper passages leading from said chamber along the upper parts of the outer sides of the bath, lower passages leading back from said upper passages along the lower parts of the outer sides of the said bath and from thence to the said chamber, a fan for circulating said products of combustion in said passages, said fan being located where the said upper passages deliver the heated gases to the lower passages, an uptake, a branch pipe by which a proportion of the products of combustion are led off to said uptake and a damper for controlling the flow of products of combustion along said branch pipe. 2. A plant for heating a bath for containing molten material and comprising a furnace from which products of combustion pass, a chamber into which the products of combustion pass, a bath, upper passages leading from said chamber along the upper parts or the outer sides of the bath, lower passages leading back from said upper passages along the lower parts 01' the outer sides 01' the said bath and from thence to the said chamber, a, fan for circulatingsaid products 01' combustion in said passages, said fan being located where the said upper passages deliver the heated gases to the lower passages, an uptake, a branch pipe by which a, proportion of the products of combustion are led oil to said uptake, said branch pipe leading from a location near the receiving end or said return passages, and a damper for controlling the flow of products of combustion along said branch pipe.

- JOHN JAMES STORDY.

i ammcas 0mm The following reierouees are oi. record in the me of this patent:

UNITED STATES PATENTS Number 

